Thomas h



WORRALL.

Patented-Apia. 17, 1888.-

M PETERS. PMQ-Liltmw'aphar. Washington, 0.6.

(No Model.)

NEEDLE CYLINDER P03 KNITTING MACHINES;

m wfl UNITED STATES PATENT "OFFIcE 1 -r THOMAS H. woRRALn-oF'LA'ooNI-n, NEW HAMPSHIRE.

NEEDLE-CYLINDER o KNITTING-MACHINES,

SPECIFICATION forming art of Letters Patent 110381.197, dated April 7; ss8.

Application filed June 17, 1887.

To all whom it may concern.- 7

Be it known that I, THOMAS H. WORRALL, of Laconia, in the county of Belknap and State of New Hampshire, have invented certain new and useful Improvementsin N eedle-Gylinders for Knitting-Machines, of which the following is a specification.

:My invention relates to needle-cylinders for circular-knitting machines of the. class com-' monly known as trick-cylinders! and comprises improvements on the invention shown and described inPatent No. 348,088, granted to Inc August 24, 1886. In said patentI have shown thesides of the main cylinderprovided with vertical grooves and the top of-the bodyring tricked orgrooved, the needle-shanksbeing clamped between two plane surfaces'of the main cylinder and body-ring and sustained laterally by the sides of the saidradial grooves form of cylinder completely answers the pure formed in the top of the body-ring. The nee-r dle-cylinder in the construction shown in said patent is formed in three parts -viz the base, the body-ring, and main cylinder. While this poses set forth in'saidpatent, it has in practice two slight objections: First, being made in three parts, it is unnecessarily expensive of manufacture; and, second, the cylinder is not readily changed from one gage of work to an other that is, from finer to coarser. These objections are entirely overcome by my present improvements, which consist in forming the cylinder in but two parts,the body or base cyl-' inder and the top-cylinder, the former having its top or upper surface formed plain and the latter having vertical grooves formed in its periphery, a plain groove being made in its lower outer edge and radial tricks or grooves formed in'its undersurface extending from the said groove in its lower outer edge vinward, said radial grooves being made of a width corresponding to the diameter of the needleshanks,andpreferablyofslightly-greaterdepth than said shanks, so that the hold on the neeidle-shanks vertically may be confined entirely to the point between the upper plain surface of the body or base cylinder and the lower plain surface of thegroove made in the lower outer edge of the top-cylinder, the sidesof the radial tricks or grooves serving merely as a lateral support for the needle shanks, and the b, and having a' circumferential groove, 0,

I radially grooved, as represented at d, said last- Iwill now proceed to make and use the same.

Reference is to be had to the accompanying drawings,and tothe letters of reference marked I thereon, forming a part'of this specification, i S

thesame letters indicating the same parts in both views. I Of the drawings, Figure 1 represents a yer-f tical section of a needle-cylinder embodying describe my invention, so that others skilled in the art maybe able to Go In this way theneedlesmay be-firmly;

my 'invention, a needle being shown in position on each'side. Fig. 2 represents a fragupside-down position, showing a needle in place.

In carrying out my invention I prefer to ment .of the top or main cylinder in reverse or 1 construct the cylinder, in two parts,"cons1s'ting of the body or base cylinder B, having aplain upper surface, a, and a top cylinder, A,p,ro-- 1 vided on its periphery with vertical groovesv formed'at its lower outeredge, the uppersurface, a, ofwhich groove is plain or flat,as shown. From said circumferential groove inward toward the center the top cylinder'is tricked or mentioned grooves being equal in number to the vertical grooves 12,- Ma width correspond ing to the diameter; of the needle-shanks e, and

of a depth preferably greaterthan said nee- I die-shanks, so that when the needles. fare placed therein, as portrayed in the drawings,

tween the upper plain surface of the bodyfior base ring and thesurface c of the circux'nfer V ential groove formed in the top cylinder, the' I sides of the. radial grooves d serving'merely-as lateral supports for the needle-shanks. In this way. the needles will be held with flabsolutetruth at a uniform height between the upper face of the body or base cylinder and the a I00 r face 0' of the circumferential groove formed'in the outer edge of the top cylinder, and'all that is necessary to change the cylinder to adapt it ,r r a. 9 the shanks will beheld vertically BnllllGiYbB- 1 to different gages or grades of work is to substitute for the top cylinder in use a top cylinder of difi'erent gage of vertical grooves b and radial tricks d, changing also, if need be, the number of the needles. The top cylinder is secured to the body or base cylinder by screws g, and the stems of the needles are clamped in the vertical grooves b by the usual clamping-sections, h, and screws 1'.

By the construction and combination of parts hereinbefore described I obtain all the advantages set forth in my patent referred to, and confine all of the tricking and grooving to a single partthe top or main cylinder-which results in a saving in the expense of constructing the cylinder and renders it readily convertible to different gages, so as to enable the machine to perform work of different grades of fineness.

Having thus set forth the nature and objects of my invention and the manner of constructing and using the same, What I claim is 1. A knitting-machine cylinder consisting of a base or body cylinder, B, and a removable top cylinder, A, the latter provided with a circum+- ferential groove at its lower outer edge, and radial tricks or grooves (1, formed in its lower surface, extending from said circumferential groove inward, substantially as and for the purposes described.

2. A knitting-machine cylinder consisting of a base or body cylinder, B, having a plain upper surface, and a removable top cylinder, A, the latter provided with a circumferential groove at its lower'outer edge, and radial tricks or grooves (1, formed in its lower surface, of a width corresponding to the diameter of the needleshanks and of greater depth than the same, and vertical peripheral grooves b, in combination with the needles and clampingsections, substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification,in the presence of two subscribing witnesses, this 6th day of June, A. D. 1887.

' THOMAS H. VVORRALL. Witnesses:

FRED L. SMITH, FRED K. SANBoRN. 

